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1.
1-x NdyLax-yMgxAl12-xO19) is a new material, tunable in the 1–1.1 μm band. We present the first results of pulsed laser emission of this crystal under
flashlamp pumping. We obtain a slope efficiency of 3.3% with a maximum average power of 40 W at 40 Hz in free-lasing regime.
Nd:Cr codoping of ASL is also tested, but with much lower efficiency.
Received: 12 June 1998/Revised version: 30 September 1998 相似文献
2.
Laser operation of the new stoichiometric crystal KYb(WO4)2 总被引:8,自引:0,他引:8
P. Klopp U. Griebner V. Petrov X. Mateos M.A. Bursukova M.C. Pujol R. Sole J. Gavalda M. Aguilo F. Güell J. Massons T. Kirilov F. Diaz 《Applied physics. B, Lasers and optics》2002,74(2):185-189
We demonstrate for the first time laser operation with the monoclinic stoichiometric crystal KYb(WO4)2 (hereafter KYbW). Lasing on the 2
F
5/2
?2
F
7/2
transition of Yb3+ at room temperature has been achieved near 1074 nm with >41% slope efficiency (>26% maximum conversion efficiency) using
a 0.5-mm-thick plate of KYbW. This new laser material holds great promise for diode-pumped high-power lasers, thin-disk and
waveguide designs as well as for ultrashort (ps/fs) pulse laser systems.
Received: 10 October 2001 / Revised version: 19 November 2001 / Published online: 17 January 2002 相似文献
3.
F. Mougel F. Augé G. Aka A. Kahn-Harari D. Vivien F. Balembois P. Georges A. Brun 《Applied physics. B, Lasers and optics》1998,67(5):533-535
3+ :Ca4GdO(BO3)3 (Nd:GdCOB). 21 mW of green cw laser emission for an absorbed pump power of 820 mW were achieved under laser diode-pumping.
64 mW of green cw laser output were obtained with 1 W of absorbed pump power under titanium-sapphire pumping. Its availability
in large-size crystals with good optical quality makes Nd:GdCOB a true challenger to the best SFD laser crystal reported so
far: Nd:YAl3(BO3)4 (Nd:YAB or NYAB).
Received: 2 March 1998/Revised version: 20 May 1998 相似文献
4.
H. Zhang X. Meng P. Wang L. Zhu X. Liu R. Cheng J. Dawes P. Dekker S. Zhang L. Sun 《Applied physics. B, Lasers and optics》1999,68(6):1147-1149
Yb:Ca4YO(BO3)3 (Yb:YCOB) crystal with good quality and large size has been grown by the Czochralski method. The polarization absorption
and fluorescence spectra have been measured. The laser action of the Yb:YCOB crystal has been demonstrated when it is pumped
by a fiber-coupled laser diode (LD) at the wavelength of 976.4 nm. The pumping threshold is 55 mW, the light-light conversion
efficiency is 58.7%, and a slope efficiency of up to 73% is thus calculated.
Received: 16 December 1998 / Revised version: 4 February 1999 / Published online: 7 April 1999 相似文献
5.
We present measurements of the net-induced gain on the 5d–4f transition at 186 nm in LiYF4 : Nd3+ optically pumped by radiation from a molecular fluorine laser. It is found that for LiYF4 : Nd3+, one of a series of potential continuously tunable VUV lasers, relatively strong excited-state absorption results in net-induced
loss. The prospects for VUV laser operation being realised in other rare-earth-doped fluorides is discussed.
Received: 4 March 1996/Revised version: 10 July 1996 相似文献
6.
Crystalline structure and optical spectroscopy of Er3+-doped KGd(WO4)2 single crystals 总被引:2,自引:0,他引:2
M.C. Pujol M. Rico C. Zaldo R. Solé V. Nikolov X. Solans M. Aguiló F. Díaz 《Applied physics. B, Lasers and optics》1999,68(2):187-197
4 )2 single crystals doped with Er3+ have been grown by the flux top-seeded-solution growth method. The crystallographic structure of the lattice has been refined,
being the lattice constants a=10.652(4), b=10.374(6), c=7.582(2) Å, β=130.80(2)°. The refractive index dispersion of the host
has been measured in the 350–1500 nm range. The optical absorption and photoluminescence properties of Er3+ have been characterised in the 5–300 K temperature range. At 5 K, the absorption and emission bands show the (2J+1)/2 multiplet
splittings expected for the C2 symmetry site of Er in the Gd site. The energy positions and halfwidths of the 72 sublevels observed have been tabulated
as well as the cross sections of the different multiplets. Six emission band sets have been observed under excitation of the
4F7/2 multiplet. The Judd–Ofelt (JO) parameters of Er3+ in KGW have been calculated: Ω2=8.90×10-20 cm2, Ω4=0.96×10-20 cm2, Ω6=0.82×10-20 cm2. Lifetimes of the 4S3/2, 4F9/2, and 4I11/2 multiplets have been measured in the 5–300 K range of temperature and compared with those calculated from the JO theory.
A reduction of the 4S3/2 and 4I11/2 measured lifetimes with increasing erbium concentration has been observed, moreover the presence of multiphonon non-radiative
processes is inferred from the temperature dependence of the lifetimes.
Received: 15 December 1997/Revised version: 10 July 1998 相似文献
7.
Excited state absorption and stimulated emission of Nd3+ in crystals. Part 2: YVO4, GdVO4, and Sr5(PO4)3F 总被引:1,自引:0,他引:1
L. Fornasiero S. Kück T. Jensen G. Huber B.H.T. Chai 《Applied physics. B, Lasers and optics》1998,67(5):549-553
3+ ion in the crystals YVO4, GdVO4, and Sr5(PO4)3F. The measurements were performed in the spectral region of the main laser transitions 4F3/2→4I9/2, 4F3/2→4I11/2, and 4F3/2→4I13/2by a continuous wave pump and probe technique. The calibrated gain and ESA spectra are presented and possible implications
of ESA on the laser performance are estimated. It is shown that ESA can be a small loss factor to the laser emission near
1060 nm but does considerably diminish the effective emission cross sections near 1340 nm especially in Nd:YVO4 and Nd:GdVO4.
Received: 29 January 1998/Revised version: 8 May 1998 相似文献
8.
Continuous-wave tunable Cr2+:ZnS laser 总被引:1,自引:0,他引:1
I.T. Sorokina E. Sorokin S. Mirov V. Fedorov V. Badikov V. Panyutin A. Di Lieto M. Tonelli 《Applied physics. B, Lasers and optics》2002,74(6):607-611
We report the first continuous-wave tunable over ∼280 nm around 2.3 μm room-temperature operation of a chemical vapor transport-grown
and diffusion-doped Cr2+:ZnS laser, pumped by a Co:MgF2 laser at 1.67 μm and generating over 100 mW of output power at 16% slope efficiency. The self-consistent results of the laser
and spectroscopic analysis demonstrate a large potential of this crystal as an active medium for diode-pumped tunable mid-infrared
sources.
Received: 7 January 2002 / Revised: 14 March 2002 / Published online: 2 May 2002 相似文献
9.
Comparison of cw laser performance of Nd:KGW, Nd:YAG, Nd:BEL, and Nd:YVO4 under laser diode pumping 总被引:4,自引:0,他引:4
A.A. Demidovich A.P. Shkadarevich M.B. Danailov P. Apai T. Gasmi V.P. Gribkovskii A.N. Kuzmin G.I. Ryabtsev L.E. Batay 《Applied physics. B, Lasers and optics》1998,67(1):11-15
4 crystals under low-power laser diode end-pumping. Output power dependencies on the pump power and the pump wavelength of
these diode-pumped solid state lasers were investigated. The high Nd3+ concentration of the Nd:KGW samples used in our measurements as well as up-conversion and exited-state absorption processes
in Nd:KGW cause the reduced laser output power dependence on the pump wavelength which was experimentally observed. At pump
levels up to 270 mW a slope efficiency of ηsl≈46% was reached for the Nd:KGW laser. Nd:KGW microchip laser operation with a slope efficiency of ηsl≈50% was demonstrated. Thermal lensing in Nd:KGW at pump powers up to 3 W was measured.
Received: 4 August 1997 相似文献
10.
L. Fornasiero T. Kellner S. Kück J.P. Meyn P.E.-A. Möbert G. Huber 《Applied physics. B, Lasers and optics》1999,68(1):67-72
3+ ions in CaWO4, LaSc3(BO3)4, and YLiF4 crystals are presented. The spectra were measured by a continuous-wave pump and probe technique. It is shown that ESA is
a negligible loss mechanism in cw lasers emitting at 1.06 μm. In contrast, the effective emission cross sections in Nd:CaWO4 and Nd:LaSc3(BO3)4 around 1.35 μm are considerably diminished.
Received: 8 May 1998/Revised version: 7 September 1998 相似文献
11.
An analytical model is developed to study the influence of the Auger upconversion process on the thermal loading under lasing
and nonlasing conditions. With the developed model, Auger upconversion rates can be determined by comparing theoretical calculations
with experimental results for the ratio of the thermal loading under lasing and nonlasing conditions. The upconversion rates
obtained with the present method are compared with the results measured from the fluorescence decay experiment.
Received: 7 June 1999 / Revised version: 3 August 1999 / Published online: 30 November 1999 相似文献
12.
cw dual-wavelength operation of a diode-end-pumped Nd:YVO4 laser 总被引:16,自引:0,他引:16
Y.-F. Chen 《Applied physics. B, Lasers and optics》2000,70(4):475-478
A dual-wavelength continuous wave (cw) diode-end-pumped Nd:YVO4 laser that generates simultaneous laser action at the wavelengths 1064 nm and 1342 nm is demonstrated. The optimum oscillation
condition for the simultaneous dual-wavelength operation in a diode-end-pumped solid-state laser has been derived. The relationship
between the laser cavity and the output stability is also studied. Experimental results show that the stability of the output
power at the two wavelengths could be enhanced by use of a three-mirror cavity.
Received: 26 August 1999 / Revised version: 11 October 1999 / Published online: 23 February 2000 相似文献
13.
S. Naumov E. Sorokin V.L. Kalashnikov G. Tempea I.T. Sorokina 《Applied physics. B, Lasers and optics》2003,76(1):1-11
We report stable self-starting near-transform-limited 26-fs pulses at 250-mW output power from a Kerr-lens mode-locked (KLM)
Cr4+:YAG laser using chirped mirrors in combination with prisms. The highest output power achieved in KLM regime was 600 mW at
55-fs pulse duration. The experimental results agree well with the results of theoretical analysis with respect to KLM self-starting
ability and stability against continuous-wave and multi-pulse operation. Parameter ranges for stable transform-limited KLM
pulses as well as the shortest achievable pulse durations are established. Using an InGaAs-InP semiconductor saturable absorber
mirror we could obtain self-starting 57-fs pulses at the average output power of 200 mW. Two-photon absorption was found to
be the main mechanism favoring the multiple-pulse operation.
Received: 2 May 2002 / Revised version: 16 July 2002 / Published online: 8 January 2003
RID="*"
ID="*"Corresponding author. Fax: +43-1/58801-38799, E-mail: sorokina@tuwien.ac.at 相似文献
14.
A. Agnesi S. Dell’Acqua A. Guandalini G. Reali A. Toncelli M. Tonelli E. Cavalli 《Applied physics. B, Lasers and optics》2000,71(2):153-156
CW diode-pumped laser operation of Nd3+ in Ca3Sc2Ge3O12 (CaSGG) single garnet crystal has been demonstrated for the first time. We measured an 18% slope efficiency and 2.7-nm tunability
with two different laser cavities. A spectroscopic characterization of our sample has also been performed including the absorption
cross section in the 800-nm region and the emission cross section and radiative lifetime of the upper laser level.
Received: 7 December 1999 / Revised version: 6 February 2000 / Published online: 27 April 2000 相似文献
15.
Costela A. García-Moreno I. Gómez C. Amat-Guerri F. Liras M. Sastre R. 《Applied physics. B, Lasers and optics》2003,76(4):365-369
We report on the laser action of modified dipyrromethene.BF2 complexes both dissolved in poly(methyl methacrylate) and copolymerized with methyl methacrylate. All recently synthesized
dyes have the chromophore core of laser dye pyrromethene 567, differing in the substituent in position 8. The new dyes showed
important and most significant increases in both lasing efficiency and photostability. When the laser samples were pumped
transversely at 534 nm, laser emission was obtained with efficiencies of over 30% in most cases, to be compared with a lasing
efficiency of 12% exhibited by reference dye pyrromethene 567 under the same experimental conditions. Some of the materials
exhibited highly photostable laser action, with no sign of degradation in the laser output after 60000 pump pulses at the
same position of the sample at a repetition rate of 10 Hz, whereas the laser emission of reference dye pyrromethene 567 dropped
to zero after less than 40000 pump pulses.
Received: 19 November 2002 /
Revised version: 20 February 2003 / Published online: 9 April 2003
RID="*"
ID="*"Corresponding author. Fax: +34-91/564-2431, E-mail: acostela@iqfr.csic.es 相似文献
16.
Nonlinear absorption properties of Co2+:MgAl2O4 crystal 总被引:2,自引:0,他引:2
K.V. Yumashev I.A. Denisov N.N. Posnov P.V. Prokoshin V.P. Mikhailov 《Applied physics. B, Lasers and optics》2000,70(2):179-184
The differential absorption spectra of Co2+: MgAl2O4 (MALO) crystal were studied with a picosecond pump-probe technique under excitation of the 4A2→4T1(4P) and 4A2→4T1(4F) transitions of the tetrahedral Co2+ ion. The difference spectra of stimulated emission (SE) and excited state absorption (ESA) were derived from the measured
differential absorption spectra. The 4T1(4P)→4A2 SE band around 660 nm was observed. The ESA bands were assigned to the 4T2→4T1(4P) transition and to transitions from the thermally populated 2E(2G) excited state to doublet levels arising from the 2F free-ion level of the tetrahedrally coordinated Co2+ ion. Absorption saturation measurements were performed at 1.34 μm and 1.54 μm. Passive Q-switching of 1.34-μm Nd3+:YAlO3 and 1.54-μm Er3+:glass lasers was realized using the Co2+:MALO crystal as saturable absorber. The Q-switched laser pulses of 38 ns (110 ns) in duration and up to 2.7 mJ (10 mJ) in
energy at 1.54 μm (1.34 μm) were obtained.
Received: 3 March 1999 / Revised version: 30 June 1999 / Published online: 30 November 1999 相似文献
17.
P.B.W. Burmester T. Kellner K. Petermann G. Huber R. Uecker P. Reiche 《Applied physics. B, Lasers and optics》1999,68(6):1143-1146
Second-harmonic generation was z-cut observed Gd1-xYxCa4O(BO3)3 (Gd1-xYxCOB) and the dependence of the phase-matching wavelength on the mixing ratio x has been investigated. The dependence on both
temperature and angle tuning was examined as well. We found the suitable composition for noncritical frequency doubling at
930 nm, which is the lasing wavelength of Nd:YAlO3 on the 4F3/2?4I9/2 transition.
Received: 19 April 1999 / Published online: 5 May 1999 相似文献
18.
4 F3/2 excited state of the Nd3+ ion in Y3Al5O12, YAlO3, and Y2O3 were measured in a continuous wave pump- and probe experiment in a wide spectral range from 850 nm (780 nm for Y3Al5O12) to 1500 nm. The cross sections were determined from a comparison with the emission spectra and the simultaneously measured
ground state absorption bleaching. The strongest excited state absorption transitions were found in the 1220–1400 nm spectral
region due to transitions to the 2G9/2 and 4G7/2 levels. The spectral positions of the measured transitions are in good agreement with the theoretically expected transitions
calculated from the known Stark-level splittings.
Received: 4 December 1997/Revised version: 8 May 1998 相似文献
19.
The polarized absorption spectra, infrared fluorescence spectra, upconversion visible fluorescence spectra, and fluorescence decay curve of orientated Nd3+:KGd(WO4)2 crystal were measured at room-temperature. Some important spectroscopic parameters were investigated in detail in the framework of the Judd-Ofelt theory and the Fuchtbauer-Ladenburg formula. The effect of the crystal structure on the spectroscopic properties of the Nd3+ ions was analyzed. The relation among the spectroscopic parameters and the laser performances of the Nd3+:KGd(WO4)2 crystal was discussed. 相似文献
20.
A.V. Podlipensky V.G. Shcherbitsky N.V. Kuleshov V.I. Levchenko V.N. Yakimovich M. Mond E. Heumann G. Huber H. Kretschmann S. Kück 《Applied physics. B, Lasers and optics》2001,72(2):253-255
Efficient continuous-wave laser operation of Cr2+:ZnSe was demonstrated with an output power of 1400 mW at an absorbed pump power of 1900 mW from a Tm:YAG laser. Under continuous-wave
diode pumping at 1.54 μm an output power of 15 mW was obtained from a Cr+2:ZnSe laser. Excited state absorption is shown to be negligible in the pump and laser spectral region.
Received: 12 October 2000 / Published online: 30 November 2000 相似文献